From the course: Electronics Foundations: Semiconductor Devices
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Field-effect transistors
From the course: Electronics Foundations: Semiconductor Devices
Field-effect transistors
- [Instructor] Unlike bipolar junction transistors, which work by biasing a pair of P-N junctions, field-effect transistors turn on and off by using an electric field to control the behavior of a semiconductor material, making it more or less conductive. There are two main types of field-effect transistors, junction field-effect transistors, referred to as JFETs, and metal-oxide-semiconductor field-effect transistors, or MOSFETs. There are a lot of similarities between JFETs and MOSFETs, but MOSFETs are more widely used because they have a higher input impedance than JFETs. So, for this course, I'll be focusing primarily on MOSFETs. The physical structure of a MOSFET begins with a slab of doped semiconductor material called the body. And for this example, I'll use P-type semiconductor material for the body. A small section of oppositely doped material, called a well, is deposited near each end of the body. And in this…
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